Transmission



F. H. BULTMAN, JR

Oct. 26 1926.

' TRANSMISSION Filed March 17, 1919 Patented Oct. 26, 1926.-

Unirse STATES PATENT ortica FREDERICK H. BULTMAN, JR., OF CLEVELAND, OI-IIO.

TRANSMISSION.

Application filed March 17, 1919. Serial No. 283,061,

This invention relates to a power transwhich are secured to the spider. Surroundmitt-ing device which is particularly ining the gears 24e is a ring gear 26 having 55 tended to provide a high rat-io of reduction teeth upon its internal surtace. The inbetween a driving and a driven shaft. ternal teeth o1E ring gear 26 mesh with the 5 The object of the invention is to provide a teeth ot the' gears 24.

speed change mechanism in which the vari- Upon a counter shatt, 27 there 1s secured ous elements may be cornpactly arranged a gear 28, the teeth ot which mesh with the H0 thereby enabling' them to be encompassed external teeth upon ring gear 26. There within a comparatively small space which is also a second gear 29 secured upon the 1U it is not possible to accomplish by using' counter shaft 27 and the teeth of gear 29 gears in a manner which is at present mesh with the teeth ot a gear 30 which is known in the art S0 far as I am aware, mounted upon a shaft 31 which may con- 65 Generally speaking, the invention may veniently be a stub shaft.

be said to comprise the elements and the The gear 50 as shown in the drawing Combinations thereof set forth in the acmeshes with gear Assuming that Shaft conipanying claim. 2O is the driving shaft and rotating in a Reference should be had to the accoinclockwise direction, it then rotates gear 22 'I0 panying drawings forming a part ot this clockwise which in turn rotates the spider specification in which Fig. l a sectional gears 24 in a counter-cloclrwise direction 2U elevation oi' a mechanism embodying my Also gear 22 rotates gear 30 counter-clockintention. wise which in turn rotates gear 29 clockwise Fig. 2 is a side elevation oi' the gear arand gear 28 also rotates clockwise. Gear 28 75 rangement shown in Fig 1. rotates the rlng gear 26 1n a counter-clock- The principle which underlies the present wise direction and the gears 2stare rotating 25 invention is that of providing a spider 0n their aXes in the saine direction and in which Carries a @me or gears and suhjectmesh with the internal teeth of ring gear 26. ing this gear 0r gears t0 the Simultaneous .lt Will be evident that VZlOuS numbers 80 drivingacfion from other gears which last oi 'teeth ma;7 he employed upon the various mentioned gears are driven at such surface gears, tor the purpose ot 'toi-ming various 30 rates ot speed with respect to their respecspeed relationships between shafts 20 and tive pitch lines, that there is produced `a 2l. For instance, when gear 22 has 12 diiiierent speed which is imparted to the teeth, gear 3() any number ot' teeth, gear H5 spider and causes the spider' to rotate about 29, 12 teeth, gear 2t, 16 teeth, ring gear its own axis. 26, 49 external teeth and 36 internal teeth,

B The spider is attached or connected to a and the idler gears each 12 teeth, under such shaft. In the specification and the forms conditions the speed relationship between oit the invention explained, the shaft conshafts 2() and 2l is as 120 to 1 or in other 90 nectcd to the spider is the driven shaft bewords, shaft 2O will make 120 revolutions cause in the following description l am ez;- while 21 makes 1 revolution.

L10 plaining the gear arrangement, as a speed The surface speed at the pitch line ot reducing` device, gear 22 differs from the surface speed at the Referring to the drawing, 20 indicates a pitch line of the internal teeth of ring gear 95 shaft which may he called the driving shaft, 26 and the spider with the gears 24 must and 21 indicates what may be termed a move its axis because of this fact. When driven shaft. This designation is correct the surface speed at the pitch line of gear 22 where the purpose is to produce a speed is greater than the surface speed at the reducing arrangement. Upon shaft 20 pitch lline of the internal teeth of ring 100 there is mounted or otherwise secured a gea-r 26, the spider rotates about its axis gear 22. in the same direction as gear 22 and vice 50 Upon the shaft 21 and mounted to rot-ate versa.

therewith is a spider 23. Upon the spider Having described my invention, I claim: there are mounted a plurality of gears 2li, A transmission device comprising a spider 105 these gears heilig mounted upon studs 25 mounted for rotation about its own axis, a

gear mounted on the spider, a ring gear having external and internal teeth, the internal teeth meshing;` with the gear on the spider, a shaft, a gear driven from said shaft and meshing with the gear on the Spider, a countershaft, a gear on said countereha'i'ty meshing with the external teeth ofthe ring gear, a second gear on the countershaft and a gear Connecting the gear on the countershaft with the gear on the 10 shaft first mentioned. V in testimony whereof', I hereunto my signature.

FREDERICK H. BULTMAN, JR. 

